Chief calls San Diego officer's death 'an assassination'

Officials release grim details of the shooting of Jeremy Henwood, 36, a 4th-year officer who served with Marines in Afghanistan. Bystanders came to his aid and helped officers quickly track down the shooter.

For several hours police surrounded an apartment building, believing a second suspect was barricaded inside. Finally forcing their way into the apartment, SWAT officers found no one.

But they did find a rambling, semi-coherent suicide note apparently written by White.

The motive for the shooting at the El Cajon fast-food restaurant parking lot is unknown, Collins said. The victim is expected to survive, according to a homicide official with the San Diego County Sheriff's Department.